Depending on the longest Dimensional event, you will have time to obtain things from Yggdrasil. Every day you will gain a level so there are going to obviously be a maximum of 10 final Days in Yggdrasil. Depending on your actions in Yggdrasil you will gain limited Items which can only be obtained from Yggdrasil. These limited Items will become more powerful the LONGER you save them so keep this in mind.

Anything goes. You will encounter other players while in Yggdrasil, and you should plan encounters wisely or not. Make friends and make enemies remember 1v1 in Yggdrasil you are all even.

Dimensional Players need to list atleast 3, obtainable resources that are obtainable because they exist, please list them Here.

For Example

Myself Player Yuki and Yukitero
Event modifier - 11 Ai's

Item list 1-13 Spheres + Sphere shards
a Sphere is obtained by crafting 6 Sphere Shards into one.
A Sphere can be used to summon a Sphere, or revive a dead one.
A Sphere Shard can be obtained through random drops.
A Sphere Shard will summon the corresponding Ai or Player.

Item list 14 Void Sanctum Fragment
Collect all 12 fragments to allow Marriage in the multiverse.

I can handle a maximum of over 1000 items. So feel free to go wild.